International Journal

Title79. Heechang Oh and Choongsik Bae, “Effects of the injection timing on spray and combustion characteristics in a spray-guided DISI engine under the lean-stratified operation”, Fuel, Vo. 107, pp225-235, 2013 (SCI; IF 3.357, citation : 8)


An experimental study was carried out to investigate the effects of injection timing on spray and combustion characteristics in a spray guided direct injection spark ignition (DISI) engine under lean stratified operation. In-cylinder pressure analysis, exhaust emissions measurement, and visualization of combustion and spray were applied. Combustion in a stratified DISI engine was found to have both lean premixed and mixing controlled flame characteristics. The stratified mixture characteristic for the injection timing was verified as a dominant factor of the flame characteristics. For the early injection timing, non-luminous flame and low combustion efficiency were observed due to the over-mixed mixture formation. On the contrary, luminous sooting flame was shown at the late injection timing because of under-mixed mixture formation. In addition, smoke emission and incomplete combustion products were increased at the late injection timing due to increased locally rich area of the mixture. On the other hand, nitrogen oxides (NOx) emissions were decreased while indicated mean effective pressure (IMEP) was increased as the injection timing was retarded. The retarded combustion phasing was verified as the reason in this observation.


Previous78. Yongjin Jung, Choongsik Bae, Seibum B. Choi, and Hyun Dong Shin, “Premixed Compression Ignition Combustion with Various Injector Configurations in a Heavy Duty Diesel Engine,” Proc. IMechE, Part D, Journal of Automobile Engineering, vol. 227, No. 3, pp422-432, 2013 (SCI; IF 0.583, citation : 0)
Next80. Jaeheun Kim, Choongsik Bae, and Gangchul Kim, “Simulation on the effect of the combustion parameters on the piston dynamics and engine performance using the Wiebe function in a free piston engine“, Applied Energy, vol. 107, pp446-455, 2013 (SCI; IF 4.783, citation : 8)
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